Pendulum of a clock is made of INVAR so that

Neither the clock loses time in summer due to expansion, nor it gains time in winter due to contraction

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To make the clock heavy

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Both

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None

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Solution

The correct option is A Neither the clock loses time in summer due to expansion, nor it gains time in winter due to contraction
INVAR is an alloy of iron and nickel,and it has a negligible small co- efficient of linear expansion.the pendulum of a clock is made of INVAR so that neither the clock loses time in summer due to expansion ,nor it gains time in winter due to contraction.

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